Mean Magnetic Moments in bcc Fe–Co Alloys

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Abstract
Saturation magnetizations in the binary Fe–Co system were redetermined since an earlier investigation (P. Weiss and R. Forrer, Ann. Phys. 12, 1929) was made prior to the discovery of a CsCl-type ordered structure that has a wide solubility range. The alloys were quenched from 850°C at various rates in an attempt to suppress the ordering reaction. The magnetizations decreased as the quenching rate increased for alloys containing between 30 and 70 at.% cobalt. A maximum difference at 3% in the mean moment p was obtained for an equiatomic alloy quenched at the extreme rates. The mean moments for the ordered alloys are in good agreement with the previous investigation. The data for the fast quenched (presumably disordered) alloys indicate that the Slater-Pauling curve, in the electron-concentration range between iron and cobalt, has a maximum at about 28 at.% cobalt, compared with the 35 at.% suggested by the data of Weiss and Forrer.